我有一个自定义视图,我曾经用它绘制不同的大小和图像到画布.这很棒.所以每次我绘制的东西我都会将这些信息添加到actionList中.
当用户退出应用程序时,我将此actionList作为字符串保存到sharedPreference.在用户重新打开应用程序时,我获取此数据并使用Gson将其转换回List prevIoUs_drawn_paths并使用此更新actionList.
当我这样做时,我得到分段错误,但有数据和内存参考.我也附加了代码和tombstone logcat.
DrawingView.java
public class DrawingView extends View {
public enum Type {
PATH,TEXT,STAMP;
}
/**
* Different type of draw
*/
public enum Mode {
DRAW,ERASER,STAMP;
}
/**
* Different Modes for Drawing
*/
public enum Drawer {
PEN,LINE,ELLIPSE;
}
/**
* Different Modes of Stamps
*/
public enum Stamper {
STAR,THUMB;
}
private Context context = null;
private Canvas canvas = null;
private Bitmap bitmap = null;
private int width;
private int height;
private int historyPointer = 0;
private List<DrawingAction> prevIoUs_action_list = new ArrayList<>();
private String TAG = this.getClass().getCanonicalName();
public List<DrawingAction> getPrevIoUs_action_list() {
return prevIoUs_action_list;
}
public void setPrevIoUs_action_list(List<DrawingAction> prevIoUs_action_list) {
this.prevIoUs_action_list = prevIoUs_action_list;
updateHistoryPath();
}
/**
* Collection of different types of actions
*/
private List<DrawingAction> actionLists = new ArrayList<>();
public List<DrawingAction> getActionLists() {
return actionLists;
}
/**
* Flags for maintaining the states
*/
private boolean enabled = false;
private boolean isDown = false;
private Mode mode = Mode.DRAW;
private Drawer drawer = Drawer.PEN;
private Stamper stamper = Stamper.STAR;
private float startX = 0F;
private float startY = 0F;
private Paint drawPaint;
private Paint erasePaint;
private Paint textPaint;
private Bitmap starPaint;
private Bitmap thumbPaint;
public DrawingView(Context context) {
super(context);
this.setup(context);
}
public DrawingView(Context context,AttributeSet attrs) {
super(context,attrs);
this.setup(context);
}
public DrawingView(Context context,AttributeSet attrs,int defStyleAttr) {
super(context,attrs,defStyleAttr);
this.setup(context);
}
private void setup(Context context) {
this.context = context;
createDrawPaint();
createErasePaint();
createTextPaint();
createStamperPaint(context);
}
private void createDrawPaint() {
this.drawPaint = new Paint();
this.drawPaint.setAntiAlias(true);
this.drawPaint.setStyle(Paint.Style.stroke);
this.drawPaint.setstrokeWidth(10F);
this.drawPaint.setstrokeCap(Paint.Cap.BUTT);
this.drawPaint.setstrokeJoin(Paint.Join.MITER);
this.drawPaint.setColor(Color.RED);
this.drawPaint.setAlpha(255);
}
private void createErasePaint() {
this.erasePaint = new Paint();
this.erasePaint.setColor(Color.WHITE);
this.erasePaint.setAlpha(255);
this.erasePaint.setAntiAlias(true);
this.erasePaint.setDither(true);
this.erasePaint.setStyle(Paint.Style.stroke);
this.erasePaint.setstrokeJoin(Paint.Join.ROUND);
this.erasePaint.setstrokeCap(Paint.Cap.ROUND);
this.erasePaint.setstrokeWidth(10F);
}
private void createTextPaint() {
this.textPaint = new Paint();
this.textPaint.setAntiAlias(true);
this.textPaint.setStyle(Paint.Style.stroke);
this.textPaint.setstrokeCap(Paint.Cap.BUTT);
this.textPaint.setstrokeJoin(Paint.Join.MITER);
this.textPaint.setTypeface(Typeface.DEFAULT);
this.textPaint.setTextSize(56F);
this.textPaint.setTextAlign(Paint.Align.RIGHT);
this.drawPaint.setColor(Color.RED);
this.textPaint.setstrokeWidth(0F);
}
private void createStamperPaint(Context context) {
this.starPaint = BitmapFactory.decodeResource(context.getResources(),R.mipmap.stamp_star);
this.thumbPaint = BitmapFactory.decodeResource(context.getResources(),R.mipmap.stamp_thumb);
}
private DrawingAction getCurrentAction() {
return this.actionLists.get(this.historyPointer-1);
}
private void drawText(DrawingAction action,Canvas canvas) {
String text = action.getText();
if((text == null) || (text.length() <= 0)) {
return;
}
float textx = action.getPositionX();
float textY = action.getPositionY();
Paint paintMeasureText = new Paint();
float textLength = paintMeasureText.measureText(text);
float lengthOfChar = textLength / (float) text.length();
float restWidth = this.canvas.getWidth() - textx; // text-align : right
int numChars = (lengthOfChar <= 0) ? 1 : (int) Math.floor((double) (restWidth / lengthOfChar)); // The number of characters at 1 line
int modNumChars = (numChars < 1) ? 1 : numChars;
float y = textY;
for (int i = 0,len = text.length(); i < len; i += modNumChars) {
String substring = "";
if ((i + modNumChars) < len) {
substring = text.substring(i,(i + modNumChars));
} else {
substring = text.substring(i,len);
}
//Todo: Adjust according to the font size
y += 56F;
canvas.drawText(substring,textx,y,this.textPaint);
}
}
private void updateHistory(DrawingAction action) {
if (this.historyPointer == this.actionLists.size()) {
this.actionLists.add(action);
Log.d(TAG,"history pointer update"+this.historyPointer);
this.historyPointer++;
} else {
// Removing the unused actions in history
this.actionLists.set(this.historyPointer,action);
this.historyPointer++;
for (int i = this.historyPointer,size = this.actionLists.size(); i < size; i++) {
this.actionLists.remove(this.historyPointer);
}
}
}
private void updateHistoryPath()
{
for(int index=0 ; index<prevIoUs_action_list.size(); index++)
{
Log.d(TAG,"adding canvas index from prevIoUs list"+index);
if (prevIoUs_action_list.get(index).getType()!=null)
{
updateHistory(new DrawingAction(prevIoUs_action_list.get(index).getType(),prevIoUs_action_list.get(index).getPath(),prevIoUs_action_list.get(index).getPaint()));
}
}
}
public boolean undo() {
if (this.historyPointer > 1) {
this.historyPointer--;
this.invalidate();
return true;
} else {
return false;
}
}
public boolean redo() {
if (this.historyPointer < this.actionLists.size()) {
this.historyPointer++;
this.invalidate();
return true;
} else {
return false;
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.TRANSPARENT);
if (this.bitmap != null) {
canvas.drawBitmap(this.bitmap,0F,new Paint());
}
// this.historyPointer
for (int i = 0; i < this.historyPointer; i++) {
DrawingAction action = this.actionLists.get(i);
Type type = action.getType();
if(type == Type.PATH) {
canvas.drawPath(action.getPath(),action.getPaint());
Log.d("lingaraj","on draw history index"+i);
}
else if(type == Type.TEXT) {
this.drawText(action,canvas);
}
else if(type == Type.STAMP) {
Stamper stamper = action.getStamper();
if(stamper == Stamper.STAR) {
canvas.drawBitmap(this.starPaint,action.getPositionX(),action.getPositionY(),new Paint());
}
else if(stamper == Stamper.THUMB) {
canvas.drawBitmap(this.thumbPaint,new Paint());
}
}
}
this.canvas = canvas;
}
@Override
protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(width,height);
}
public void setCustomWidth(int width) {
this.width = width;
}
public int getCustomWidth() {
return this.width;
}
public void setCustomHeight(int height) {
this.height = height;
}
public int getCustomHeight() {
return this.height;
}
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
public boolean getEnabled() {
return this.enabled;
}
public void setMode(Mode mode) {
this.mode = mode;
}
public Mode getMode() {
return this.mode;
}
public void setDrawer(Drawer drawer) {
this.drawer = drawer;
this.mode = Mode.DRAW;
}
public void setStamper(Stamper stamper) {
this.stamper = stamper;
this.mode = Mode.STAMP;
}
public void setBitmap(Bitmap bitmap) {
this.bitmap = bitmap;
invalidate();
}
}
DrawingAction.java：
public class DrawingAction {
private DrawingView.Type type;
private Path path;
private Paint paint;
private String text;
private DrawingView.Stamper stamper;
private float positionX;
private float positionY;
public DrawingAction(DrawingView.Type type,Path path,Paint paint) {
this.type = type;
this.path = path;
this.paint = paint;
}
public DrawingAction(DrawingView.Type type,Paint paint,float positionX,float positionY) {
this.type = type;
this.path = path;
this.paint = paint;
this.positionX = positionX;
this.positionY = positionY;
}
public DrawingAction(DrawingView.Type type,String text,float positionY) {
this.type = type;
this.text = text;
this.positionX = positionX;
this.positionY = positionY;
}
public DrawingAction(DrawingView.Type type,DrawingView.Stamper stamper,float positionY) {
this.type = type;
this.stamper = stamper;
this.positionX = positionX;
this.positionY = positionY;
}
public DrawingView.Type getType() {
return type;
}
public Path getPath() {
return path;
}
public void setPath(Path path) {
this.path = path;
}
public Paint getPaint() {
return paint;
}
public void setPaint(Paint paint) {
this.paint = paint;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public DrawingView.Stamper getStamper() {
return stamper;
}
public void setStamper(DrawingView.Stamper stamper) {
this.stamper = stamper;
}
public float getPositionX() {
return positionX;
}
public void setPositionX(float positionX) {
this.positionX = positionX;
}
public float getPositionY() {
return positionY;
}
public void setPositionY(float positionY) {
this.positionY = positionY;
}
}
MainActivity.java：
public class MainActivity extends AppCompatActivity {
public static final String TAG = "Draw";
private DrawingView drawing;
private CanvasScroll scroll;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_correct);
drawing = (DrawingView) findViewById(R.id.canvasDrawing);
List<DrawingAction> drawing_action_list = new ArrayList<>();
drawing_action_list = stringToList(Settings.getCorrectionPath(getApplicationContext()));
disableScroll();
if (drawing_action_list.isEmpty())
{
Log.d(TAG,"Drawing action list empty prevIoUs path not drawn");
}
else
{
drawing.setPrevIoUs_action_list(drawing_action_list);
Log.d(TAG,"Drawing action list prevIoUs path drawn on canvas");
}
}
logcat的：
A/libc : Fatal signal 11 (SIGSEGV) at 0xb7bdb5a0 (code=1),thread 2064 (hourglass.drawing)
墓碑：
backtrace: --------- log /dev/log/main 08-20 02:39:00.584 2064 2064 D dalvikvm: Not late-enabling CheckJNI (already on) 08-20 02:39:00.664 2064 2064 W dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;) 08-20 02:39:00.664 2064 2064 I dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested,referenced from method android.support.v7.view.WindowCallbackWrapper.onSearchRequested 08-20 02:39:00.664 2064 2064 W dalvikvm: VFY: unable to resolve interface method 19785: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z 08-20 02:39:00.664 2064 2064 D dalvikvm: VFY: replacing opcode 0x72 at 0x0002 08-20 02:39:00.664 2064 2064 I dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode,referenced from method android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode 08-20 02:39:00.664 2064 2064 W dalvikvm: VFY: unable to resolve interface method 19789: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode; 08-20 02:39:00.664 2064 2064 D dalvikvm: VFY: replacing opcode 0x72 at 0x0002 08-20 02:39:00.684 2064 2064 I dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations,referenced from method android.support.v7.widget.TintTypedArray.getChangingConfigurations 08-20 02:39:00.684 2064 2064 W dalvikvm: VFY: unable to resolve virtual method 448: Landroid/content/res/TypedArray;.getChangingConfigurations ()I 08-20 02:39:00.684 2064 2064 D dalvikvm: VFY: replacing opcode 0x6e at 0x0002 08-20 02:39:00.684 2064 2064 I dalvikvm: Could not find method android.content.res.TypedArray.getType,referenced from method android.support.v7.widget.TintTypedArray.getType 08-20 02:39:00.694 2064 2064 W dalvikvm: VFY: unable to resolve virtual method 470: Landroid/content/res/TypedArray;.getType (I)I 08-20 02:39:00.694 2064 2064 D dalvikvm: VFY: replacing opcode 0x6e at 0x0002 08-20 02:39:00.734 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 240K,9% free 3098K/3400K,paused 39ms,total 41ms 08-20 02:39:00.884 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 9K,9% free 3121K/3400K,paused 3ms,total 3ms 08-20 02:39:00.934 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 65.356MB for 65280012-byte allocation 08-20 02:39:00.954 2064 2072 D dalvikvm: GC_FOR_ALLOC freed <1K,1% free 66870K/67152K,paused 16ms,total 16ms 08-20 02:39:01.254 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 46K,1% free 66909K/67164K,paused 4ms,total 5ms 08-20 02:39:01.264 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 75.718MB for 10825612-byte allocation 08-20 02:39:01.284 2064 2072 D dalvikvm: GC_FOR_ALLOC freed 2K,1% free 77479K/77736K,paused 17ms,total 17ms 08-20 02:39:01.314 2064 2064 Din.co.hourglass.drawing.MainActivity: Original pixels3400/796 08-20 02:39:01.324 2064 2064 Din.co.hourglass.drawing.MainActivity: Scaled pixels1700/398 08-20 02:39:01.324 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 1K,1% free 77478K/77736K,total 3ms 08-20 02:39:01.324 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 78.296MB for 2706412-byte allocation 08-20 02:39:01.344 2064 2072 D dalvikvm: GC_FOR_ALLOC freed <1K,1% free 80121K/80380K,paused 15ms,total 15ms 08-20 02:39:01.374 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 10572K,14% free 69550K/80380K,total 3ms 08-20 02:39:01.374 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 78.738MB for 11288012-byte allocation 08-20 02:39:01.424 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,12% free 80573K/91404K,paused 2ms,total 2ms 08-20 02:39:01.424 2064 2064 Din.co.hourglass.drawing.MainActivity: Original pixels3400/830 08-20 02:39:01.424 2064 2064 Din.co.hourglass.drawing.MainActivity: Scaled pixels1700/415 08-20 02:39:01.424 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,total 3ms 08-20 02:39:01.434 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 81.429MB for 2822012-byte allocation 08-20 02:39:01.434 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,9% free 83329K/91404K,total 3ms 08-20 02:39:01.434 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,total 3ms 08-20 02:39:01.434 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 86.701MB for 5528412-byte allocation 08-20 02:39:01.444 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,3% free 88728K/91404K,total 2ms 08-20 02:39:01.484 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 16422K,4% free 72306K/75312K,total 4ms 08-20 02:39:01.484 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 81.221MB for 11070412-byte allocation 08-20 02:39:01.534 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,4% free 83117K/86124K,paused 10ms,total 10ms 08-20 02:39:01.534 2064 2064 Din.co.hourglass.drawing.MainActivity: Original pixels3400/814 08-20 02:39:01.534 2064 2064 Din.co.hourglass.drawing.MainActivity: Scaled pixels1700/407 08-20 02:39:01.544 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,paused 8ms,total 8ms 08-20 02:39:01.544 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 83.861MB for 2767612-byte allocation 08-20 02:39:01.554 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,1% free 85819K/86124K,paused 12ms,total 12ms 08-20 02:39:01.564 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 10811K,1% free 75008K/75312K,total 3ms 08-20 02:39:01.564 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 81.215MB for 8296012-byte allocation 08-20 02:39:01.574 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,1% free 83110K/83416K,paused 5ms,total 6ms 08-20 02:39:01.594 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 8101K,11% free 75009K/83416K,total 4ms 08-20 02:39:01.594 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 77.350MB for 4243212-byte allocation 08-20 02:39:01.614 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,6% free 79152K/83416K,total 2ms 08-20 02:39:01.614 2064 2064 Din.co.hourglass.drawing.MainActivity: Original pixels3400/312 08-20 02:39:01.614 2064 2064 Din.co.hourglass.drawing.MainActivity: Scaled pixels1700/156 08-20 02:39:01.614 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 4144K,9% free 76045K/83416K,total 3ms 08-20 02:39:01.614 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 83.239MB for 9356812-byte allocation 08-20 02:39:01.624 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,8% free 85182K/92556K,total 3ms 08-20 02:39:01.624 2064 2064 Din.co.hourglass.drawing.MainActivity: Bitmap Merged 08-20 02:39:01.714 2064 2064 D : HostConnection::get() New Host Connection established 0xb833f3c0,tid 2064 08-20 02:39:02.844 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 18381K,8% free 67150K/72492K,total 8ms 08-20 02:39:02.844 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 77.371MB for 12312340-byte allocation 08-20 02:39:02.884 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 8K,7% free 79165K/84516K,total 3ms 08-20 02:39:02.904 2064 2064 D lingaraj: adding canvas index from prevIoUs list0 08-20 02:39:02.904 2064 2064 D lingaraj: history pointer update0 08-20 02:39:02.904 2064 2064 D lingaraj: adding canvas index from prevIoUs list1 08-20 02:39:02.904 2064 2064 D lingaraj: history pointer update1 08-20 02:39:02.914 2064 2064 D Drawing: Drawing action list prevIoUs path drawn on canvas 08-20 02:39:03.074 2064 2064 D dalvikvm: GC_FOR_ALLOC freed 337K,7% free 79264K/84516K,total 4ms 08-20 02:39:03.074 2064 2064 I dalvikvm-heap: Grow heap (frag case) to 86.820MB for 9815116-byte allocation 08-20 02:39:03.084 2064 2064 D dalvikvm: GC_FOR_ALLOC freed <1K,6% free 88849K/94104K,total 3ms 08-20 02:39:03.084 2064 2064 F libc : Fatal signal 11 (SIGSEGV) at 0xb7bdb5a0 (code=1),thread 2064 (hourglass.drawing)
解决方法
转换和保存油漆等对象时出现问题
我有一个替代解决方案,你想要实现的目标： –
您希望以下数据列表优先保存： –
我有一个替代解决方案,你想要实现的目标： –
您希望以下数据列表优先保存： –
private DrawingView.Type type;
private Path path;
private Paint paint;
private String text;
private DrawingView.Stamper stamper;
private float positionX;
private float positionY;
取而代之,您可以使用原始数据并实现parcelable.我的意思是你不需要编写整个绘制对象,而是需要在绘制对象中设置的值,即一些原始值. (同样检查压模和类型)
